Alvin rivenburgh



(No Model.)

A. RIVENBURGH. EXTENSION ELBGTROLIER.

No. 508,343. Patented Nov. '7, 1893.

Wl TNESSES W/Qmz.

A TTOHNEYS.

YHE NATIONAL umoeRAPmNn coMPANY.

. UNITED STATES APATENT OFFICE.

ALYVIN RIVENBRGH, OF GREENFIELD, IOWA, lASSIGNOR OF ONE-HALF TO FRANKDAVID MEARS, OF SAME PLACE.

"nExTENslopN-ELECTROLIER.

SPECIFICATION forming part of Letters Patent No. 508,343, dated November7, 1893.

i VApplication filed July 2'7, 1893; Serial No. 481,643. (No model.)

.To a/ZZ whom, yit mayconcern.'

Be it known that LALVIN RIVENBURGH, of

Greentield, in the county of Adair and State of Iowa, have invented anew andlmproved Extension-Electrolier, of which the following is'aspecication, reference being had to the annexed drawings, forming a partthereof, in whicl1 v Figure l is a vertical transverse section of myimproved electrolier. Fig. 2 is a horizontal section taken on line 2 2in Fig. 1.v Fig. 8 is a sidev elevation of the sliding tube. Fig. Ais aperspective view of thesliding tube; and Fig. 5 is a vertical transversesection-of a modified form of the electrolier.

Similar letters of reference indicate corresponding parts in all theviews.

The object of my invention is to construct a simple and edective devicefor supporting electric lamps, which vmay be extended so as to hold theelectric lights at any desired elevation.

My invention consists in a tube containing strips of conductive metalconnected with the wires of the house circuit, and a tube of insulatingmaterial arranged to slide in the main tube and provided with contactsprings coinmunicating with conductors leading to the lamps through thesliding tube, all as will be hereinafter more fully described.

The tube A, forming the outer portion or casing of the electrolier, isprovided at its upper end with a flange a for attachment to the ceiling,and is furnished at its upper andlower ends with insulation b b', atopposite sides thereof, to which are attached metallic strips B, B. Theupper ends of the said metallic strips are bent over and attached to thehouse wires c c. The hole in the tube A is preferably of a rectangularcross section, and

Vthe strips B, B are dat.

To vthe space in the tube A and between the Y strips B, B', is fitted atube C of insulating material, provided at its upper end with contactsprings d d', which are arranged to contact through the strips B, B. Thesaid contact springs are insulated from each other and connected withthe wires c2, c5, extending down the tube YC, the vsaid Wires leading tothe lamps carriedV by the lower end of the tube C. The contact springsdd extend over the upper end of the tube C, and downwardly in an obliquedirection toward the center of the tube.

In the form shown in Fig. 5, conducting rods B2, B3 are supported in thetube A- by means ofthe insulating pieces b2 b3, secured case it is notnecessary to make the sliding A tube C of rectangular cross section, andin consequence of the use of insulation between the rods B2 and B3, thesaid tube maybe made of metal.

To prevent the strips B B from springing, additional pieces ofinsulation f f are inserted between the walls of the tube A and the saidstrips, and to provide for holding the tube O in any desired position inwhich it may be placed, a spring g is attached to the side of the tubeA, and arranged to press on the tube C, and to still further clamp thesaid tube C, a set screw h is inserted in the tube A, in position tobear upon the spring g.

Having thus described my invention, I claim as new and desire to secureby Letters Patentll. Au extension electrolier, comprising a supportingtube rectangular in cross section, longitudinal conductors in the tube,and a sliding tube Iitting in the bore of the supporting tube andprovided at its upper ends with springs engaging the conductors, saidsprings extending over the upper end of the sliding tube and extendingdownward in an oblique direction, substantially as described.

2. An extensionelectrolier, comprising a supporting tubehavingits borerectangular in cross section, longitudinal conductors in the tube, asliding tube fitting in the bore of the supporting tube and provided atits upper end with springs engaging the conductors, insulated wiresextending through the sliding tube, a spring secured to thev supportingtube and bearing against the sliding tube anda set screw bearing uponthe said spring, substantially as described.

-ALvIN RIVENEUEGH.

IOO

